Fuel cell

Abstract

In a fuel cell comprising a laminate wherein a membrane electrode assembly is held by separators, the separator ( 20 A) has a projection ( 21 ) contacting an membrane electrode assembly ( 10 ) with the contact angle between this projection ( 21 ) and the membrane electrode assembly ( 10 ) is set smaller than the contact angle of water with respect to the surface of the separator ( 20 A). Regardless of the surface property of the separator, a corner part formed between the separator projection and membrane electrode assembly which contact with each other is so structured that water is unlikely to remain or penetrate. Thus, the draining capability of the gas channel is enhanced, improving power generating performance.

1 . A fuel cell composed of a laminate comprising: 
 separators having projections; and    a membrane electrode assembly held by the separators,    wherein the projections contact with the membrane electrode assembly with a contact angle which is smaller than a contact angle of water with respect to a surface of the separator.    
   
   
       2 . The fuel cell according to  claim 1 , wherein the contact angle between the projection and the membrane electrode assembly is within 30 degrees.  
   
   
       3 . The fuel cell according to  claim 1 , wherein the separator is made of a metal, and conductive inclusions are projected from the surface of the separator.  
   
   
       4 . The fuel cell according to  claim 2 , wherein the separator is made of a metal, and conductive inclusions are projected from the surface of the separator.